package org.bouncycastle.asn1;

import java.io.IOException;

/**
 * DER VisibleString object.
 */
public class DERVisibleString extends ASN1Object implements DERString {
    String string;

    /**
     * return a Visible String from the passed in object.
     * 
     * @exception IllegalArgumentException
     *                if the object cannot be converted.
     */
    public static DERVisibleString getInstance(Object obj) {
        if (obj == null || obj instanceof DERVisibleString) {
            return (DERVisibleString) obj;
        }

        if (obj instanceof ASN1OctetString) {
            return new DERVisibleString(((ASN1OctetString) obj).getOctets());
        }

        if (obj instanceof ASN1TaggedObject) {
            return getInstance(((ASN1TaggedObject) obj).getObject());
        }

        throw new IllegalArgumentException("illegal object in getInstance: "
                + obj.getClass().getName());
    }

    /**
     * return a Visible String from a tagged object.
     * 
     * @param obj
     *            the tagged object holding the object we want
     * @param explicit
     *            true if the object is meant to be explicitly tagged false
     *            otherwise.
     * @exception IllegalArgumentException
     *                if the tagged object cannot be converted.
     */
    public static DERVisibleString getInstance(ASN1TaggedObject obj,
            boolean explicit) {
        return getInstance(obj.getObject());
    }

    /**
     * basic constructor - byte encoded string.
     */
    public DERVisibleString(byte[] string) {
        char[] cs = new char[string.length];

        for (int i = 0; i != cs.length; i++) {
            cs[i] = (char) (string[i] & 0xff);
        }

        this.string = new String(cs);
    }

    /**
     * basic constructor
     */
    public DERVisibleString(String string) {
        this.string = string;
    }

    public String getString() {
        return string;
    }

    public String toString() {
        return string;
    }

    public byte[] getOctets() {
        char[] cs = string.toCharArray();
        byte[] bs = new byte[cs.length];

        for (int i = 0; i != cs.length; i++) {
            bs[i] = (byte) cs[i];
        }

        return bs;
    }

    void encode(DEROutputStream out) throws IOException {
        out.writeEncoded(VISIBLE_STRING, this.getOctets());
    }

    boolean asn1Equals(DERObject o) {
        if (!(o instanceof DERVisibleString)) {
            return false;
        }

        return this.getString().equals(((DERVisibleString) o).getString());
    }

    public int hashCode() {
        return this.getString().hashCode();
    }
}
